Rotary compressor

ABSTRACT

A rotary compressor includes a motor, an eccentric shaft and a cylinder installed in a casing. The motor includes a rotor and a stator. The eccentric shaft rotates with the rotor and turns around in the cylinder. The cylinder divides the casing into a high pressure chamber and a low pressure chamber, and the high pressure chamber is disposed between the motor and cylinder, and the low pressure chamber is disposed at the bottom of the cylinder. An isolating element is installed between the cylinder and the casing for isolating the high pressure chamber and the low pressure chamber. The isolating element includes at least one reflowing hole penetrated through the isolating element and interconnected between the high pressure chamber and the low pressure chamber for isolating high and low pressures effectively.

FIELD OF THE INVENTION

The present invention relates to a rotary compressor, in particular tothe rotary compressor capable of isolating high and low pressures.

BACKGROUND OF THE INVENTION

In general, an electric compressor compresses a refrigerant to circulatethe refrigerant in a circuit, and basically a DC motor drives thecompressor to operate, so as to achieve the effects of compressing andcirculating the refrigerant. In different specifications of thecompressors, the common ones include models such as rotary compressors,scroll compressors and screw compressors.

The scroll compressor incurs a relatively higher cost due to its highlevel of difficulty of manufacture. Although both of the rotarycompressor and the screw compressor complete the compression by changingthe volume of the compressor chamber, yet the rotary compressor adopts asimple compression method and skillfully avoids the problems of thescrew compressor including the deviation of the force in an axialdirection, clearance volume and internal leakage, so as to improve thereliability and efficiency of the device and obtain a relatively highermarket share.

Basically, the rotary compressor is installed at the center of a motorrotor through an eccentric shaft as shown in FIG. 1, and the rotarycompressor 10 is installed in the casing 11, and the motor (including arotor 121 and a stator 122), the eccentric shaft 13 and the cylinder 14are installed. When the eccentric shaft 13 is rotated together with themotor rotor 121 and turned around in the cylinder 14, the eccentricshaft 13 and the cylinder wall form a series of isobaric compressorchambers (including a first chamber 15 and a second chamber 16) ofdifferent volumes, so as to achieve the effect of compressing therefrigerant gradually.

In the aforementioned conventional rotary compressor, the cylinder 14and the casing 11 are fixed simply by soldering, and there is no sealingcomponent serving as a partition between the first chamber 15 and thesecond chamber 16. If the casing of the rotary compressor is tilted, therefrigerant in the second chamber will flow to the first chamber, and ifthe casing of the rotary compressor resumes to its normal usingposition, the refrigerant will flow to the first chamber and cannotreflow to the second chamber, so as to affect the overall operationperformance of the compressor adversely and reduce the efficiency of thecompressor. In addition, the cylinder 14 and the casing 11 are fixed bysoldering, and this it is necessary to melt the metal at a solderingpoint of the cylinder 14 and the casing 11, and the soldering processgenerally requires a high temperature over 1000. The high temperature ofthe soldering may cause a deformation of the cylinder 14 easily andaffects the precision of a micro-scale inner wall of the cylinder 14significantly. As a result, the cylinder may leak or get stuck easily,particularly for a smaller rotary compressor, and the aforementionedthermal deformation issue is inevitable.

SUMMARY OF THE INVENTION

Therefore, it is a primary objective of the present invention to providea rotary compressor capable of isolating high and low pressures.

To achieve the aforementioned objective, the present invention providesa rotary compressor comprising a casing having a motor, an eccentricshaft and a cylinder installed therein, and the motor includes a rotorand a stator, and the eccentric shaft rotates with the rotor and turnsaround in the cylinder, and the cylinder divides the casing into a highpressure chamber and a low pressure chamber, and the high pressurechamber is disposed between the motor and the cylinder, and the lowpressure chamber is disposed at the bottom of the cylinder, wherein anisolating element is installed between the cylinder and the casing forisolating the high pressure chamber and the low pressure chamber, andthe isolating element includes at least one reflowing hole penetratedthrough the isolating element and interconnected between the highpressure chamber and the low pressure chamber.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a conventional rotary compressor;

FIG. 2 is a schematic view of a rotary compressor of the presentinvention; and

FIG. 3 is a bottom view of a casing and an isolating element of thepresent invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

With reference to FIGS. 2 and 3 for a schematic view of a rotarycompressor of the present invention, and a bottom view of a casing andan isolating element of the present invention respectively, the rotarycompressor comprises a casing 21 having a motor 22, an eccentric shaft23 and a cylinder 24 installed therein, and the motor 22 comprises arotor 221 and a stator 222.

The eccentric shaft 23 rotates with the rotor 221 and turns around inthe cylinder 24. The cylinder 24 includes upper and lower mounts 241,242, a cylinder part 243 disposed between the upper and lower mounts241, 242, and a fixing element 25 (which may be a bolt, a screw, asoldering point, etc, and it is a bolt in this preferred embodiment)installed between the upper and lower mounts 241, 242 and the cylinderpart 243 for fixing the three components, and the cylinder 24 dividesthe casing 21 into a high pressure chamber 26 and a low pressure chamber27, and the high pressure chamber 26 is situated between the motor 22and cylinder 24, and the low pressure chamber 27 is situated under thecylinder 24.

An isolating element 28 is installed between the cylinder 24 and thecasing 21 for isolating the high pressure chamber 26 and the lowpressure chamber 27. In an embodiment as shown in the figure, theisolating element 28 is a flange 281, wherein the flange 281 isintegrally extended from the casing 21 and protruded out from an innerwall of the casing 21 to form a circular structure and disposed at thetop of the cylinder part 243, and a free end of the flange 281 abuts theupper mount 241 to isolate the high pressure chamber 26 and the lowpressure chamber 27, and the isolating element has at least onereflowing hole 282, and the reflowing hole 282 is penetrated through theisolating element 28 and interconnected between the high pressurechamber 26 and the low pressure chamber 27.

In the assembling process, the casing 21 includes an upper casing 211, alower casing 212 and a case 213, and the flange 281 is disposed in thecase 213, and the motor 22 is installed from the top of the case 213 andfixed into the case 213, and the upper casing 211 is covered onto thecase 213, and the cylinder 24 is installed into the case 213 from thebottom of the case 213, and at least one fixing element 25 is passedfrom the bottom of the case 213 through the cylinder part 243 and fixedto the flange 281, and the cylinder 24 is fixed to the case 213.Finally, the lower casing 212 is fixed to the bottom of the case 213 tocomplete the assembling the compressor. Wherein, the rotary compressormay have three fixing elements 25 for fixing the cylinder 24, and thefixing element 25 may be a bolt or a soldering point.

Since the isolating element 28 is disposed between the cylinder 24 andthe casing 21 for isolating the high and low pressures, therefore theperformance of the compressor can be maintained at a high level, and ifthe compressor is tilted, a refrigeration oil flows from the lowpressure chamber back into the high pressure chamber to maintain theactual operation performance of the compressor, and the reflowing hole282 is provided for reflowing the refrigeration oil from the highpressure chamber 26 to the low pressure chamber 27 to give a bettercirculation. Since the isolating element further uses the fixing elementto fix the casing and the cylinder, the issue of the casing beingdeformed by heat can be avoided.

In addition, the isolating element is installed at the bottom of thecylinder part, or the isolating element is a flange, wherein the flangeis fixed in the casing and disposed at the top or the bottom of thecylinder part, and different implementations of the isolating elementcan achieve the effect of isolating the high pressure chamber and thelow pressure chamber for sure.

What is claimed is:
 1. A rotary compressor, comprising a casing having amotor, an eccentric shaft and a cylinder installed therein, and themotor having a rotor and a stator, and the eccentric shaft rotating withthe rotor and turning around in the cylinder, and the cylinder dividingthe casing into a high pressure chamber and a low pressure chamber, andthe high pressure chamber being disposed between the motor and thecylinder, and the low pressure chamber being disposed at the bottom ofthe cylinder, characterized in that an isolating element is installedbetween the cylinder and the casing for isolating the high pressurechamber and the low pressure chamber, and the isolating element includesat least one reflowing hole, and the reflowing hole is penetratedthrough the isolating element and interconnected between the highpressure chamber and the low pressure chamber.
 2. The rotary compressorof claim 1, wherein the cylinder includes upper and lower mounts and acylinder part disposed between the upper and lower mounts, and a fixingelement disposed between the upper and lower mounts for assembling andfixing the upper and lower mounts and the cylinder part.
 3. The rotarycompressor of claim 2, wherein the isolating element is a flangeintegrally extended from the casing and disposed at the top of thecylinder part.
 4. The rotary compressor of claim 2, wherein theisolating element is a flange integrally extended from the casing anddisposed at the bottom of the cylinder part.
 5. The rotary compressor ofclaim 2, wherein the isolating element is a flange fixed in the casingand disposed at the top of the cylinder part.
 6. The rotary compressorof claim 2, wherein the isolating element is a flange fixed in thecasing and disposed at the bottom of the cylinder part.
 7. The rotarycompressor of claim 1, further comprising at least one fixing elementinstalled between the isolating element and the cylinder.
 8. The rotarycompressor of claim 7, wherein the fixing element is a bolt.
 9. Therotary compressor of claim 7, wherein the fixing element is a solderingpoint.
 10. The rotary compressor of claim 1, wherein the casing includesan upper casing, a lower casing and a case, and the isolating element isdisposed in the case, and the upper casing and the lower casing arecovered and fixed to the top and the bottom of the case respectively.11. A rotary compressor, comprising a casing having a motor, aneccentric shaft and a cylinder installed therein, and the motor having arotor and a stator, and the eccentric shaft rotating with the rotor andturning around in the cylinder, and the cylinder dividing the casinginto a high pressure chamber and a low pressure chamber, and the highpressure chamber being disposed between the motor and the cylinder, andthe low pressure chamber being disposed at the bottom of the cylinder,characterized in that the cylinder includes upper and lower mounts and acylinder part disposed between the upper and lower mounts, and a fixingelement is installed between the upper and lower mounts and the cylinderpart for assembling and fixing the upper and lower mounts and thecylinder, and an isolating element is installed between the cylinder andthe casing, and the isolating element is a flange integrally extendedfrom the casing and disposed at the top of the cylinder part forisolating the high pressure chamber and the low pressure chamber, andthe isolating element includes at least one reflowing hole penetratedthrough the isolating element and interconnected between the highpressure chamber and the low pressure chamber, and at least one fixingelement is installed between the isolating element and the cylinder.